The importance of using proper terminology in maths has been proven in numerous studies. Thus, when beginning new units in maths, I also make sure that we come up with a class vocabulary poster. This poster begins with all the vocabulary that the students initially can think of that relate to the topic and as we work through the unit, we add more words to the poster.
This is also very important for any EAL students in your classroom as it helps them to develop their knowledge of the English language and add to their maths vocabulary.
Here are some examples from different maths units in my class: